In this quote, author Jilly Cooper is revealing her disbelief and surprise at the success of her books in London. She is basically saying that she never would have pictured herself composing such large and popular books in the dynamic city of London. This statement might also suggest that Cooper might have had doubts about her writing abilities or the possible success of her books before they became popular in London. In general, this quote showcases Cooper's humbleness and appreciation for the unforeseen success of her books in a major literary center like London.